[SPARK-17631] [SQL] Add HttpStreamSink for structured streaming. #15197

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zhangxinyu1:feature-http-stream-sink-for-structured-streaming

Commits on Sep 22, 2016

Add HttpStreamSink. Streaming query results can be sinked to http server
zhangxinyu1
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Commits on Sep 26, 2016

1. Replace trait HttpDataFormat by verifying that output dataFrame must hava a single string column. 2. Add HttpStreamSinkSuite to test
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modify code style of HttpStreamSinkSuite
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